EP 0361863 A1 19900404 - Communication cable having water blocking provisions in core.
Title (en)
Communication cable having water blocking provisions in core.
Title (de)
Nachrichtenkabel mit Wassersperrvorrichtungen im Kern.
Title (fr)
Câble de communication ayant des réserves pour bloquer l'eau dans le noyau.
Publication
Application
Priority
US 25089788 A 19880929
Abstract (en)
A communications cable comprising a core of transmission media such as optical fibers, for example, disposed in a core tube and a sheath system (32) includes provisions for preventing the movement of water within the cable core. Water blocking provisions (26) are disposed in the core tube and may comprise a tape or a yarn, for example, or both. The tape may comprise substrate tapes between which is disposed a superabsorbent material in powder form which upon contact with water swells and inhibits the further movement of the water. In another embodiment, a water swellable yarn may extend longitudinally linearly with the optical fibers in the core. The water blocking provisions and the ratio of the sum of the cross sectional areas of the optical fibers and of the water blocking provisions and of any other cable element within the core to the area within the core tube are such that the transmission media in the core are decoupled substantially from the sheath system in at least one direction transverse of the longitudinal axis of the cable. On the other hand, the transmission medium is coupled sufficiently to the sheath system in the longitudinal direction to cause the transmission medium substantially to be moved with the sheath system when pulling forces are applied to the cable.
IPC 1-7
IPC 8 full level
G02B 6/44 (2006.01); H01B 7/282 (2006.01); H01B 7/288 (2006.01)
CPC (source: EP KR US)
G02B 6/4433 (2013.01 - EP KR US); G02B 6/4435 (2013.01 - EP KR US); G02B 6/44384 (2023.05 - EP KR US); G02B 6/562 (2023.05 - EP KR US); H01B 7/288 (2013.01 - EP KR US)
Citation (search report)
- [Y] WO 8606178 A1 19861023 - AMERICAN TELEPHONE & TELEGRAPH [US]
- [Y] DE 3330957 A1 19850321 - PHILIPS PATENTVERWALTUNG [DE]
- [Y] EP 0269778 A1 19880608 - FREUDENBERG CARL FA [DE]
- [YP] EP 0286349 A2 19881012 - AMERICAN TELEPHONE & TELEGRAPH [US]
- [Y] DE 8130044 U1 19820311
Designated contracting state (EPC)
DE ES FR GB IT SE
DOCDB simple family (publication)
EP 0361863 A1 19900404; EP 0361863 B1 19940105; CA 1329241 C 19940503; DE 68912047 D1 19940217; DE 68912047 T2 19940428; DK 170188 B1 19950606; DK 478789 A 19900330; DK 478789 D0 19890928; ES 2047680 T3 19940301; JP 2726714 B2 19980311; JP H02155122 A 19900614; KR 0139539 B1 19980701; KR 900005493 A 19900414; US 4909592 A 19900320
DOCDB simple family (application)
EP 89309786 A 19890926; CA 612367 A 19890921; DE 68912047 T 19890926; DK 478789 A 19890928; ES 89309786 T 19890926; JP 24824789 A 19890926; KR 890013881 A 19890927; US 25089788 A 19880929